.tui-checkbox:checked {
    background: #2dd4be;
    border: solid 1px #2dd4be;
  }
  .tui-checkbox {
    width: 0.8rem;
    height: 0.8rem;
    background-color: #ffffff;
    border: solid 1px #dddddd;
    -webkit-border-radius: 50%;
    border-radius: 50%;
    font-size: 0.8rem;
    margin: 0;
    padding: 0;
    position: relative;
    display: inline-block;
    vertical-align: center;
    cursor: default;
    -webkit-appearance: none;
    -webkit-user-select: none;
    user-select: none;
    -webkit-transition: background-color ease 0.6s;
    transition: background-color ease 0.6s;
  }
  .tui-checkbox:checked::after {
    content: '';
    top: 0.15rem;
    left: 0.15rem;
    position: absolute;
    background: transparent;
    border: #fff solid 2px;
    border-top: none;
    border-right: none;
    height: 0.15rem;
    width: 0.3rem;
    -moz-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    -webkit-transform: rotate(-45deg);
    transform: rotate(-45deg);
  }